Agilent Technologies FieldFox N9912A User Manual

60 N9912A FieldFox User’s Guide
Time domain Gate Shape setting
Gate Shape
Passband
Ripple
Sidelobe
Levels
Cutoff Time
Minimum Gate
Span
Minimum
0.1 dB
-48 dB
1.4/Freq Span
2.8/Freq Span
Normal
0.1 dB
-68 dB
2.8/Freq Span
5.6/Freq Span
Wide
0.1 dB
-57 dB
4.4/Freq Span
8.8/Freq Span
Maximum
0.01 dB
-70 dB
12.7/Freq Span
25.4/Freq Span
Cutoff time is the time between the stop time (-6 dB on the filter skirt) and the
peak of the first sidelobe.
 T
1
is the gate span, which is equal to the stop time minus the start time.
 T
2
is the time between the edge of the passband and the 6 dB point,
representing the cutoff rate of the filter.
 T
3
is the time between the 6 dB point and the edge of the gate stopband.
For all filter shapes T
2
is equal to T
3
, and the filter is the same on both sides of
the center time.
Minimum gate span is twice the cutoff time. Each gate shape has a minimum
recommended gate span for proper operation. This is a consequence of the finite
cutoff rate of the gate. If you specify a gate span that is smaller than the
minimum span, the response will show the following effects:
 distorted gate shape that has no passband
 distorted shape
 incorrect indications of start and stop times
 may have increased sidelobe levels.

Agilent Technologies FieldFox N9912A Specifications

General

Brand	Agilent Technologies
Model	FieldFox N9912A
Category	Measuring Instruments
Language	English